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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49bef6b874aafadf3697b7534b015201b014a58da75a73b55f4e7f67d563259b' 
  AND token = '7MTzB138KI53QolEs7FBLcVAxx3KFz04Qfs9qWvAEcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}